diff --git a/mods/ENTITIES/mcl_mobs/spawning.lua b/mods/ENTITIES/mcl_mobs/spawning.lua
index 120cae9dc..f6e9f8109 100644
--- a/mods/ENTITIES/mcl_mobs/spawning.lua
+++ b/mods/ENTITIES/mcl_mobs/spawning.lua
@@ -525,6 +525,7 @@ if mobs_spawn then
 			local mob_def = mob_library_worker_table[mob_index]
 			local spawn_in_group = minetest.registered_entities[mob_def.name].spawn_in_group or 4
 			local spawn_in_group_min = minetest.registered_entities[mob_def.name].spawn_in_group_min or 1
+			local mob_type = minetest.registered_entities[mob_def.name].type
 			if spawn_check(spawning_position,mob_def) then
 					if mob_def.type_of_spawning == "water" then
 						spawning_position = get_water_spawn(spawning_position)
@@ -537,7 +538,7 @@ if mobs_spawn then
 					end
 					--everything is correct, spawn mob
 					local object
-					if spawn_in_group then
+					if spawn_in_group and ( mob_type ~= "monster" or math.random(5) == 1 ) then
 						object = spawn_group(spawning_position,mob_def,{minetest.get_node(vector.offset(spawning_position,0,-1,0)).name},spawn_in_group,spawn_in_group_min)
 					else
 						object = minetest.add_entity(spawning_position, mob_def.name)